Dear All,
I am trying to write an script to calculate geometric centre of selected residues of a protein structure. Say I have a PDB file (a text containing the x, y, and z coordinates of atoms of a protein). I want to extract the X coordinates of the atoms belonging to the interested residues... (2 Replies)
I am trying to use two files and walk through the first one to see if a value from each record resides in the other file.
I am reading the file record by record and awking out the first field into a varaiable. That is working fine.
When I try to write my grep command it gives me an error.
... (7 Replies)
Hi,
I need a little help with variable use:
I have the a file with follow format:
Type: Test
Profile: 010
84240 27 15
84900 11 09
84993 55 44
84762 12 12
I need to look the value in the line containing "Profile" and put in front of the lines containing numbers... (6 Replies)
Hi Friends,
I have a problem when i run this piece of script, and do echo $? it always gives me value 0, even if the string "CCRCWebServerINSTALLDIR" is not present in that file. Why is that so, can you give me suggestion to the changes i need to make?
$find... (3 Replies)
Hi All,
I need to compare the string variable with input value which have more than one word which also should be case insensitive.
#!/bin/sh
echo "please choose your choice: "
read choice
if ` ]
then echo "correct"
else
echo "wrong"
fi
but i am getting the output for first word... (3 Replies)
hello there,
basically im screwed with a variable that should take the last modification date of a file.
my code is
fileCreationTime=$(( `ls -l $fileName | tr -s " " | cut -d " " -f6` ))
my problem arise coz when the code is executed and stored in a file the return value is 1993 and not... (4 Replies)
my script is some thing like this
i11="{1,2,3,4,5,6,7,8,9,10,11,}"
echo "enter value"
read value ..............suppose i11
x="$value"
echo "$($value)" .............the echo should be {1,2,3,4,5,6,7,8,9,10,11,}
but its showing "i11" only.
plz help me out to get desired... (10 Replies)
Discussion started by: sagar_1986
10 Replies
LEARN ABOUT PHP
eval
EVAL(3) 1 EVAL(3)eval - Evaluate a string as PHP codeSYNOPSIS
mixed eval (string $code)
DESCRIPTION
Evaluates the given $code as PHP.
Caution
The eval(3) language construct is very dangerous because it allows execution of arbitrary PHP code. Its use thus is discouraged.
If you have carefully verified that there is no other option than to use this construct, pay special attention not to pass any user
provided data into it without properly validating it beforehand.
PARAMETERS
o $code
- Valid PHP code to be evaluated. The code mustn't be wrapped in opening and closing PHP tags, i.e. 'echo "Hi!";' must be passed
instead of '<? echo "Hi!"; >'. It is still possible to leave and reenter PHP mode though using the appropriate PHP tags, e.g.
'echo "In PHP mode!"; ?>In HTML mode!<? echo "Back in PHP mode!";'. Apart from that the passed code must be valid PHP. This
includes that all statements must be properly terminated using a semicolon. 'echo "Hi!"' for example will cause a parse error,
whereas 'echo "Hi!";' will work. A return statement will immediately terminate the evaluation of the code. The code will be exe-
cuted in the scope of the code calling eval(3). Thus any variables defined or changed in the eval(3) call will remain visible
after it terminates.
RETURN VALUES eval(3) returns NULL unless return is called in the evaluated code, in which case the value passed to return is returned. If there is a
parse error in the evaluated code, eval(3) returns FALSE and execution of the following code continues normally. It is not possible to
catch a parse error in eval(3) using set_error_handler(3).
EXAMPLES
Example #1
eval(3) example - simple text merge
<?php
$string = 'cup';
$name = 'coffee';
$str = 'This is a $string with my $name in it.';
echo $str. "
";
eval("$str = "$str";");
echo $str. "
";
?>
The above example will output:
This is a $string with my $name in it.
This is a cup with my coffee in it.
NOTES
Note
Because this is a language construct and not a function, it cannot be called using variable functions.
Tip
As with anything that outputs its result directly to the browser, the output-control functions can be used to capture the output of
this function, and save it in a string (for example).
Note
In case of a fatal error in the evaluated code, the whole script exits.
SEE ALSO call_user_func(3).
PHP Documentation Group EVAL(3)